US7407323B2 - Methods and systems for determining temperature of an object - Google Patents

Methods and systems for determining temperature of an object Download PDF

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US7407323B2
US7407323B2 US11/347,712 US34771206A US7407323B2 US 7407323 B2 US7407323 B2 US 7407323B2 US 34771206 A US34771206 A US 34771206A US 7407323 B2 US7407323 B2 US 7407323B2
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temperature
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infrared sensor
object
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David R. Hutcherson
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Amphenol Thermometrics Inc
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GE Infrastructure Sensing LLC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry
    • G01J5/10—Radiation pyrometry using electric radiation detectors
    • G01J5/12—Radiation pyrometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
    • G01J5/14—Electrical features
    • G01J5/16—Arrangements with respect to the cold junction; Compensating influence of ambient temperature or other variables

Abstract

Methods and systems for detecting a temperature TO of a remote object are provided. The method includes storing in memory, a lookup table relating an output voltage of an infrared sensor to a temperature sensed by the infrared sensor V(TO, TA), determining a temperature sensor voltage output corresponding to a temperature TA proximate the infrared sensor, determining a first voltage as a function of the temperature TA proximate the infrared sensor and a reference temperature TREF, V(TA, TREF), determining a second voltage as a function of the temperature of the object TO and the reference temperature TREF, V(TO, TREF) by combining the determined temperature sensor voltage output and the first voltage, and determining a temperature of the object TO from the lookup table using the second voltage.

Description

BACKGROUND OF THE INVENTION

This invention relates generally to temperature sensors, and more particularly to methods and apparatus for deriving an object temperature using an IR thermopile sensor to over a wide range of object and ambient temperatures based on a single compact lookup table.

Infrared (IR) thermopile sensors are used to measure the temperature of remote objects. The output voltage of the thermopile sensor varies with both object temperature and ambient temperature of the sensor. Although the general shape of the characteristics curve is known, there are relatively large variations between contributions of individual parts of the sensor to the characteristics curve. For accurate measurement each sensor is individually calibrated at known temperatures. During normal operation, the calibration data is used in conjunction with the measured ambient temperature to give an accurate indication of object temperature. However, the relationship between output voltage and temperature is a 4th power equation requiring a significant computational requirement to solve.

BRIEF DESCRIPTION OF THE INVENTION

In one embodiment, a method for detecting a temperature TO of a remote object includes storing in memory, a lookup table relating an output voltage of an infrared sensor to a temperature sensed by the infrared sensor V(TO, TA), determining a temperature sensor voltage output corresponding to a temperature TA proximate the infrared sensor, determining a first voltage as a function of the temperature TA proximate the infrared sensor and a reference temperature TREF, V(TA, TREF), determining a second voltage as a function of the temperature of the object To and the reference temperature TREF, V(TO, TREF) by combining the determined temperature sensor voltage output and the first voltage, and determining a temperature of the object TO from the lookup table using the second voltage.

In another embodiment, a system for determining a temperature of a remote object includes an infrared temperature sensor, a temperature sensor configured to detect a temperature of the infrared sensor, a memory including a lookup table of infrared temperature sensor output voltage versus object temperature and associated information, and a processor communicatively coupled to the infrared temperature sensor, temperature sensor, and memory. The processor is programmed to store in memory, a lookup table relating an output voltage of an infrared sensor to a temperature sensed by the infrared sensor V(TO, TA), determine a voltage output of the temperature sensor that corresponds to a temperature TA proximate the infrared temperature sensor, determine a first voltage as a function of the temperature TA proximate the infrared sensor and a reference temperature TREF, V(TA, TREF), determine a second voltage as a function of the temperature of the object TO and the reference temperature TREF, V(TO, TREF) by combining the determined temperature sensor voltage output and the first voltage, and determine a temperature of the object TO from the lookup table using the second voltage.

In yet another embodiment, a computer program embodied on a computer readable medium for detecting a temperature TO of a remote object is provided. The computer program includes a code segment that stores in memory, a lookup table relating an output voltage of an infrared sensor to a temperature sensed by the infrared sensor V(TO, TA), determines a temperature sensor voltage output corresponding to a temperature TA proximate the infrared sensor, determines a first voltage as a function of the temperature TA proximate the infrared sensor and a reference temperature TREF, V(TA, TREF), determines a second voltage as a function of the temperature of the object TO and the reference temperature TREF, V(TO, TREF) by combining the determined temperature sensor voltage output and the first voltage, and determines a temperature of the object TO from the lookup table using the second voltage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a thermopile sensor system in accordance with an exemplary embodiment of the present invention;

FIG. 2 is a flow diagram of an exemplary method of determining a temperature of an object TO;

FIG. 3 is a table illustrating results of an alternative exemplary technique for a lookup table using interpolation between adjacent data pairs;

FIG. 4 is a flow diagram of an exemplary method of generating a lookup table of TO versus a voltage as a function of the temperature of the object TO and the ambient temperature TA(V(TO, TA)); and

FIG. 5 is a flow diagram of an exemplary method of determining an equation for a voltage as a function of the temperature of the object TO and the reference temperature TREF(V(TO, TREF))

 DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a block diagram of a thermopile sensor system 100 in accordance with an exemplary embodiment of the present invention. System 100 includes a thermopile detector 102 configured to receive infrared radiation that is correlative to the temperature TO of a remote object 104. Thermopile detector 102 provides a low level analog output varying with both object temperature TO and ambient temperature TA. An ambient temperature sensor 106, used to measure the ambient temperature of the thermopile is located proximate to thermopile detector 102. In the exemplary embodiment, ambient temperature sensor 106 is a thermistor. In various alternative embodiments, ambient temperature sensor 106 is a silicon temperature sensor or resistance temperature detector (RTD).

Thermopile detector 102 is communicatively coupled to a low noise amplifier 108 and to analog-to-digital converter 110. Ambient temperature sensor 106 is communicatively coupled to analog-to-digital converter 112. The outputs of analog-to-digital converters 110 and 112 are transmitted to computer 114. A memory 116, such as a read only memory (ROM) is communicatively coupled to computer 114.

As used herein, the term “computer” may include any processor-based or microprocessor-based system including systems using microcontrollers, reduced instruction set circuits (RISC), application specific integrated circuits (ASICs), logic circuits, and any other circuit or processor capable of executing the functions described herein. The above examples are exemplary only, and are thus not intended to limit in any way the definition and/or meaning of the term “computer”.

Computer 114 executes a set of instructions that are stored in one or more storage elements, in order to process input data. The storage elements may also store data or other information as desired or needed. The storage element may be in the form of an information source or a physical memory element within or communicatively coupled to computer 114.

The set of instructions may include various commands that instruct computer 114 as a processing machine to perform specific operations such as the methods and processes of the various embodiments of the invention. The set of instructions may be in the form of a software program. The software may be in various forms such as system software or application software. Further, the software may be in the form of a collection of separate programs, a program module within a larger program or a portion of a program module. The software also may include modular programming in the form of object-oriented programming. The processing of input data by the processing machine may be in response to user commands, or in response to results of previous processing, or in response to a request made by another processing machine.

As used herein, the terms “software” and “firmware” are interchangeable, and include any computer program stored in memory for execution by a computer, including RAM memory, ROM memory, EPROM memory, EEPROM memory, and non-volatile RAM (NVRAM) memory. The above memory types are exemplary only, and are thus not limiting as to the types of memory usable for storage of a computer program.

In the exemplary embodiment, memory 116 is used to store a lookup table (LUT) of thermopile output voltage versus object temperature characteristic, along with associated information. Processor 114 is used to perform the necessary calculations and lookup processes.

FIG. 2 is a flow diagram of an exemplary method 200 of determining a temperature of an object TO. Method 200 includes determining 202 an ambient temperature TA of thermopile 102, determining 204 a first voltage as a function of ambient temperature TA and a reference temperature TREF, for example, 25° Celsius. Method 200 also includes determining 206 a second voltage as a function of the temperature of the object TO and the reference temperature TREF and determining 208 TO from a lookup table stored in memory.

A simple technique for using a lookup table is to output data from the data pair closest to the inputted value. This will lead to varying errors, being at a maximum when the true value is midway between adjacent data pairs. The errors can be reduced by using smaller intervals between the data points, however using smaller intervals requires larger lookup tables with a corresponding demand on memory size.

FIG. 3 is a table 300 illustrating results of an alternative exemplary technique for a lookup table using interpolation between adjacent data pairs. A column 302 illustrates LUT data pairs at 5° C. intervals, for example, 45.00° C. and 50.00° C. and shows the calculated temperatures at intermediate temperatures (0.5° C. steps) using linear interpolation. A column 304 illustrates a temperature on the Kelvin scale corresponding to the temperature shown in column 302. A column 306 illustrates a voltage as a function of the temperature of the object TO and the reference temperature TREF, for example, 25° C. A column 308 illustrates a calculated TO using linear interpolation, and a column 310 shows a corresponding error in the calculated TO using linear interpolation.

FIG. 4 is a flow diagram of an exemplary method 400 of generating a lookup table of TO versus a voltage as a function of the temperature of the object TO and the ambient temperature TA(V(TO, TA)). Method 400 includes measuring 402 thermopile 102 output at two temperatures of object 104 and one ambient temperature. In the exemplary embodiment, ambient temperature TA equals approximately TREF, for example, 25° C. Method 400 includes determining 404 calibration coefficients S and B by:
Assume V=S(TO B −T A B), where

    • V=Output voltage from thermopile,
    • TO=Object temperature in K
    • TA=Ambient temperature in K
    • S=Sensitivity coefficient
    • B=Coefficient (approximately 4)

S and B can be determined by measurements at two conditions (TO1, TA1). (TO2, TA2) ensuring that where TO does not equal TA)
V 1 =S(T O B −T A B)  Equation 1
V 2 =S(T A B −T REF B)  Equation 2

Divide Equation 2 by Equation 1:
V 2 /V 1=(T O B −T A B)/(T A B −T REF B)

B is determined using numerical iteration.

Equation 1 is rearranged to solve for S.
S=V 1/(T O B −T A B)  Equation 3

S can now be calculated from V1 and B

S and B are used 406 in Equation 1 to generate the look-up table for the TA=TREF condition and the look-up table is uploaded 408 to ROM 116.

TO V(TO, TA)

For fixed temperature intervals, values of TO are not saved in the look-up table, but are calculated from the index position of the data point in the table.

The lookup table is used to determine V(VA, TREF) at 204 (shown in FIG. 2).

FIG. 5 is a flow diagram of an exemplary method 500 of determining an equation for a voltage as a function of the temperature of the object TO and the reference temperature TREF(V(TO, TREF)).

The output voltage of thermopile is expressed 502 using:
V(T O , T A)=S (T O B −T A B), where  Equation 4

  • V(TO, TA) represents the output voltage from the thermopile,
  • TO represents the object temperature in degrees Kelvin,
  • TA represents ambient (detector) temperature in degrees Kelvin,
  • S, B represents calibration coefficients determined by practical measurements

Rewriting 504 Equation 4 with TO->TA and TA->TREF where TREF is a reference temperature, equation 4 yields:
V(T A , T REF)=S(T A B −T REF B)  Equation 5

Adding 506 equations 4 and 5 yields:

V ⁡ ( T O , T A ) + V ⁡ ( T A , T REF ) = ⁢ S ⁡ ( T O B - T A B ) + ⁢ S ⁡ ( T A B - T REF B ) = ⁢ S ⁡ ( T O B - T REF B ) = ⁢ V ⁡ ( T O , T REF ) ⁢ ⁢ V ⁡ ( T O , T REF ) = V ( T O , T A ) + V ⁡ ( T A , T REF ) Equation ⁢ ⁢ 6 ⁢

During normal operation, TO is calculated 508 by determining TA, which is calculated from the ambient temperature sensor output. V(TA, TREF) is determined 510 from the look-up table. V(TO, TREF) is determined 512 from Equation 6, and then TO is determined 514 from the look-up table.

The following example is based on a sensor for which calibration coefficients S & B have been derived from practical measurements.

Calibration coefficients S 1.249E−09 B 3.871 Reference temperature TA = TREF 25.00 ° C. TA = TREF 298.15 K Calculate lookup table TO TO V(TO, TREF) ° C. K mV Start 25 298.15 0.000 30 303.15 0.315 35 308.15 0.645 40 313.15 0.990 45 318.15 1.352 50 323.15 1.731 55 328.15 2.127 60 333.15 2.540 65 338.15 2.972 70 343.15 3.422 75 348.15 3.892 80 353.15 4.381 85 358.15 4.891 End Application conditions TO 60.00 ° C. TO 333.15 K TA 45.00 ° C. TA 318.15 K Calculated output V(TO, TA) 1.1879 mV Reverse calculation of T0 from voltage TA 45.00 ° C. Notes V(TA, TREF) 1.352 mV Read from LUT V(TO, TREF) 2.540 mV V(TO, TA) + V(TA, TREF) TO 60.00 ° C. Read from LUT

The method of the various embodiments of the present invention use techniques for using look-up tables that facilitate improving the accuracy of the measurement. The simplest technique for using a lookup table is to output data from the data pair closest to the inputted value. This will lead to varying errors, being at a maximum when the true value is midway between adjacent data pairs. The errors can be reduced by using smaller intervals between the data points, but this approach can require large tables with a corresponding demand on memory size.

The above-described embodiments of infrared radiation temperature sensors provides a cost-effective and reliable means for calculating the temperature of an object viewed by a thermopile. More specifically, an algorithm is generated using a single dimension look up table in conjunction with a linear interpolation to determine the temperature of the object viewed by the thermopile, rather than using a two dimensional lookup table. As a result, an infrared radiation based temperature sensor system is provided that facilitates determining temperature of a remote object using limited computing power.

Exemplary embodiments of infrared temperature measuring systems are described above in detail. The measuring system components illustrated are not limited to the specific embodiments described herein, but rather, components of each measuring system may be utilized independently and separately from other components described herein. For example, the measuring system components described above may also be used in combination with other measuring systems. As used herein, objects includes people, vehicles, packages, animals, buildings, or any other object.

While the invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.

Claims (16)

1. A method of detecting a temperature TO of a remote object, said method comprising:
measuring an output of an infrared sensor directed toward the remote object at two temperatures of the remote object and a temperature TA proximate the infrared sensor;
determining calibration coefficients S and B from the measured output at the two temperatures;
determining a voltage output of a temperature sensor, the voltage output corresponding to the temperature TA, V(TO, TA);
generating a lookup table relating the output voltage of the infrared sensor to the temperature sensed by the infrared sensor, V(TO, TA) versus the temperature TO of the object at a plurality of temperatures using the determined values of S and B;
storing the lookup table in a memory;
determining a temperature sensor voltage output corresponding to a temperature TA proximate the infrared sensor;
determining a first voltage as a function of the temperature TA proximate the infrared sensor and a reference temperature TREF, V(TA, TREF);
determining a second voltage as a function of the temperature of the object TO and the reference temperature TREF, V(TO, TREF) by combining the determined temperature sensor voltage output and the first voltage; and
determining a temperature of the object TO from the lookup table using the second voltage.
2. A method in accordance with claim 1 wherein a voltage output of the infrared sensor is given by V=S(TO B−TA B), where
V=output voltage from thermopile,
TO=object temperature in ° K
TA=ambient temperature in ° K
S=sensitivity coefficient
B=calibration coefficient, and
wherein determining calibration coefficients S and B comprises:
measuring a first voltage output of the infrared sensor at a first temperature such that V1=S(TO B−TA B);
measuring a second voltage output of the infrared sensor at a second temperature such that V2=S(TA B−TREF B);
combining the first voltage output and the second voltage output such that V2/V1=(TO B−TA B)/(TA B−TREF B)
determining B using numerical iteration; and
determining S by solving V1=S(TO B−TA B) for S such that S=V1/(TO B−TA B) using the measured value for V1 and the determined value for B.
3. A method in accordance with claim 1 wherein determining a first voltage, V(TA, TREF) comprises determining a first voltage V(TA, TREF) using V(TA, TREF)=S(TO B−TA B).
4. A method in accordance with claim 1 wherein determining a second voltage, V(TO, TREF) comprises determining a second voltage, V(TO, TREF) using V(TO, TREF)=(TO, TA)+(TA, TREF).
5. A system for determining a temperature of a remote object comprising:
an infrared temperature sensor;
a temperature sensor configured to detect a temperature of the infrared sensor;
a memory comprising a lookup table comprising a plurality of data points that relate the temperature sensor voltage output corresponding to a temperature TA proximate the infrared sensor, V(TO, TA) for infrared sensor outputs at a plurality of temperatures of the object and temperatures TA proximate the infrared sensor; and
a processor communicatively coupled to said infrared temperature Sensor, temperature sensor, and memory wherein the processor is programmed to:
store in memory, a lookup table relating an output voltage of an infrared sensor to a temperature sensed by the infrared sensor V(TO, TA);
determine a voltage output of the temperature sensor that corresponds to a temperature TA proximate the infrared temperature sensor;
determine a first voltage as a function of the temperature TA proximate the infrared sensor and a reference temperature TREF, V(TA, TREF);
determine a second voltage as a function of the temperature of the object TO and the reference temperature TREF, V(TO, TREF) by combining the determined temperature sensor voltage output and the first voltage; and
determine a temperature of the object TO from the lookup table using the second voltage.
6. A system in accordance with claim 5 wherein a voltage output of the infrared sensor is given by V=S(TO B−TA B), where
V=output voltage from thermopile,
TO=object temperature in ° K
TA=ambient temperature in ° K
S=sensitivity coefficient
B=calibration coefficient, and
wherein calibration coefficients S and B are determined by:
a measurement of a first voltage output of the infrared sensor at a first temperature such that V1=S(TO B−TA B);
a measurement of a second voltage output of the infrared sensor at a second temperature such that V2=S(TA B−TREF B);
a combination of the first voltage output and the second voltage output such that V2/V1=(TO B−TA B)/(TA B−TREF B)
a determination of B using numerical iteration; and
a determination of S by solving V1=S(TO B−TA B) for S such that S=V1/(TO B−TA B) using the measured value for V1 and the determined value for B.
7. A system in accordance with claim 6 wherein the values of S and B to are used generate the lookup table of the output voltage of an infrared sensor to the temperature sensed by the infrared sensor, V(TO, TA) versus the temperature TO of the object at a plurality of temperatures.
8. A system in accordance with claim 5 wherein the first voltage V(TA, TREF) is determined using V(TA, TREF)S(TO B- TA B).
9. A system in accordance with claim 5 wherein the second voltage, V(TO, TREF) is determined using V(TO, TREF)=(TO, TA)+(TA, TREF).
10. A system in accordance with claim 5 wherein said temperature sensor comprises at least one of a thermistor, a silicon temperature sensor, and an RTD.
11. A system in accordance with claim 5 wherein said infrared sensor comprises a thermopile.
12. A computer program embodied on a computer readable medium for detecting a temperature TO of a remote object, said program comprising a code segment that:
stores in memory, a lookup table relating an output voltage of an infrared sensor to a temperature sensed by the infrared sensor V(TO, TA);
determines a temperature sensor voltage output corresponding to a temperature TA proximate the infrared sensor;
determines a first voltage as a function of the temperature TA proximate the infrared sensor and a reference temperature TREF, V(TA, TREF) where V(TA, TREF)=S(TO B−TA B);
determines a second voltage as a function of the temperature of the object TO and the reference temperature TREF, V(TO, TREF) by combining the determined temperature sensor voltage output and the first voltage;
determines a temperature of the object TO from the lookup table using the second voltage; and
outputs the determined temperature,
where, TO=object temperature in ° K
TA=ambient temperature in ° K
S=sensitivity coefficient
B=calibration coefficient.
13. A computer program in accordance with claim 12 further comprising a code segment for generating the lookup table that:
measures the infrared sensor output at two temperatures of the object and the temperature TA proximate the infrared sensor;
determines calibration coefficients S and B from the measured temperatures;
determines temperature sensor voltage output corresponding to a temperature TA proximate the infrared sensor, V(TO, TA).
14. A computer program in accordance with claim 12 wherein a voltage output of the infrared sensor is given by V=S(TO B−TA B), where
V=output voltage from thermopile,
TO=object temperature in ° K
TA=ambient temperature in ° K
S=sensitivity coefficient
B=calibration coefficient, and
the computer program further comprises a code segment for determining the calibration coefficients S and B that:
measures a first voltage output of the infrared sensor at a first temperature such that V1=S(TO B−TA B);
measures a second voltage output of the infrared sensor at a second temperature such that V2=S(TA B−TREF B);
combines the first voltage output and the second voltage output such that V2/V1=(TO B−TA B)/(TA B−TREF B)
determines B using numerical iteration; and
determines S by solving V1=S(TO B−TA B) for S such that S=V1/(TO B−TA B) using the measured value for V1 and the determined value for B.
15. A computer program in accordance with claim 13 further comprising a code segment that generates the lookup table of the output voltage of an infrared sensor to the temperature sensed by the infrared sensor, V(TO, TA) versus the temperature TO of the object at a plurality of temperatures using the determined values of S and B.
16. A computer program in accordance with claim 12 further comprising a code segment that determines a second voltage, V(TO, TREF) using V(TO, TREF)=(TO, TA)+(TA, TREF).
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8193802B2 (en) 2008-04-09 2012-06-05 Milwaukee Electric Tool Corporation Slidably attachable non-contact voltage detector
US20120218022A1 (en) * 2011-02-25 2012-08-30 Linear Technology Corporation Accurate Current Sensing with Heat Transfer Correction
US8274273B2 (en) 2008-03-07 2012-09-25 Milwaukee Electric Tool Corporation Test and measurement device with a pistol-grip handle
US20150168220A1 (en) * 2013-12-17 2015-06-18 Ricoh Company, Ltd. Semiconductor integrated circuit
US9488527B2 (en) 2014-03-25 2016-11-08 Rosemount Inc. Process temperature measurement using infrared detector
US9857228B2 (en) 2014-03-25 2018-01-02 Rosemount Inc. Process conduit anomaly detection using thermal imaging

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008005167A1 (en) * 2008-01-19 2009-07-23 Testo Ag Thermal camera
US8727611B2 (en) 2010-11-19 2014-05-20 Nest Labs, Inc. System and method for integrating sensors in thermostats
US8944338B2 (en) 2011-02-24 2015-02-03 Google Inc. Thermostat with self-configuring connections to facilitate do-it-yourself installation
US9448567B2 (en) 2010-11-19 2016-09-20 Google Inc. Power management in single circuit HVAC systems and in multiple circuit HVAC systems
US9092039B2 (en) 2010-11-19 2015-07-28 Google Inc. HVAC controller with user-friendly installation features with wire insertion detection
US9104211B2 (en) 2010-11-19 2015-08-11 Google Inc. Temperature controller with model-based time to target calculation and display
US9003816B2 (en) 2010-11-19 2015-04-14 Google Inc. HVAC controller with user-friendly installation features facilitating both do-it-yourself and professional installation scenarios
US20140003462A1 (en) * 2012-06-28 2014-01-02 Brooklands, Inc. Thermometer display
US8708242B2 (en) 2012-09-21 2014-04-29 Nest Labs, Inc. Thermostat system with software-repurposable wiring terminals adaptable for HVAC systems of different ranges of complexity
US8452382B1 (en) 2012-09-21 2013-05-28 Brooklands Inc. Non-contact thermometer sensing a carotid artery
US9223545B2 (en) * 2012-09-24 2015-12-29 Texas Instruments Incorporated Modified fixed-point algorithm for implementing infrared sensor radiation equation
US9470580B2 (en) * 2013-09-26 2016-10-18 Rosemount Inc. Infrared sensor
US9568201B2 (en) 2014-03-28 2017-02-14 Google Inc. Environmental control system retrofittable with multiple types of boiler-based heating systems
US9581342B2 (en) 2014-03-28 2017-02-28 Google Inc. Mounting stand for multi-sensing environmental control device
JP2015190833A (en) * 2014-03-28 2015-11-02 セイコーエプソン株式会社 Circuit arrangement, temperature detector, electronic device, and temperature detection method
US9791839B2 (en) 2014-03-28 2017-10-17 Google Inc. User-relocatable self-learning environmental control device capable of adapting previous learnings to current location in controlled environment
JP2015227777A (en) * 2014-05-30 2015-12-17 Tdk株式会社 Temperature detection device
GB2528044B (en) 2014-07-04 2018-08-22 Arc Devices Ni Ltd Non-touch optical detection of vital signs
US8965090B1 (en) 2014-07-06 2015-02-24 ARC Devices, Ltd Non-touch optical detection of vital signs
US9854973B2 (en) 2014-10-25 2018-01-02 ARC Devices, Ltd Hand-held medical-data capture-device interoperation with electronic medical record systems
DE102015122452A1 (en) * 2015-12-21 2017-06-22 Heimann Sensor Gmbh Method and system for non-contact temperature measurement
CN107576410A (en) * 2017-09-12 2018-01-12 北京天诚同创电气有限公司 Temperature checking method and device

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777568A (en) * 1971-12-21 1973-12-11 Sensors Inc D. c. electronic apparatus for ir radiation temperature measurement
US4215336A (en) * 1978-04-17 1980-07-29 Mcneil-Akron, Inc. Apparatus and method for stabilization of a thermistor temperature sensor
US4251291A (en) 1979-02-01 1981-02-17 Gomez Ernesto E Thermoelectric generator with latent heat storage
US4301682A (en) * 1979-08-24 1981-11-24 Everest Charles E Infrared thermometer in making stress-degree measurements for irrigation purposes
US4358957A (en) * 1980-09-05 1982-11-16 Teledyne Isotopes Temperature measuring method and apparatus
US6048093A (en) * 1994-03-30 2000-04-11 Exergren Corporation Differential radiation detector probe
US6241384B1 (en) * 1996-10-25 2001-06-05 Exergen Corporation Axillary infrared thermometer and method of use
US20020140215A1 (en) 1992-05-05 2002-10-03 Breed David S. Vehicle object detection system and method
US6499877B2 (en) * 1997-06-24 2002-12-31 Exergen Corporation Ambient and perfusion normalized temperature detector
US20040058488A1 (en) 2002-05-08 2004-03-25 Arno Jose I. Monitoring system comprising infrared thermopile detetor
US20040057494A1 (en) * 2002-09-19 2004-03-25 Simon Tsao Ear thermometer with improved temperature coefficient and method of calibration thereof
US20040066832A1 (en) * 2002-10-07 2004-04-08 Hung-Te Lin Temperature measurement device
US20040075544A1 (en) 2000-11-29 2004-04-22 Holger Janssen System and method for monitoring the surrounding area of a vehicle
US20050094705A1 (en) * 2003-11-05 2005-05-05 Microlife Intellectual Property Gmbh Infrared thermometer and method for determining temperature
US7084342B2 (en) * 2003-06-17 2006-08-01 Watlow Electric Manufacturing Co. Semi-compensated pins for cold junction compensation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2919665B2 (en) * 1992-04-28 1999-07-12 株式会社日立製作所 Heat monitoring device and the temperature measuring method and the heat source monitoring robot system
DE19757447A1 (en) * 1997-12-23 1999-07-01 Braun Gmbh Temperature calculation method for radiation thermometer
CA2374235A1 (en) * 1999-05-18 2000-11-23 University Of Iowa Research Foundation Production of complex carbohydrates
JP4990451B2 (en) * 2001-08-30 2012-08-01 コンビ株式会社 Tri-fold stroller

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777568A (en) * 1971-12-21 1973-12-11 Sensors Inc D. c. electronic apparatus for ir radiation temperature measurement
US4215336A (en) * 1978-04-17 1980-07-29 Mcneil-Akron, Inc. Apparatus and method for stabilization of a thermistor temperature sensor
US4251291A (en) 1979-02-01 1981-02-17 Gomez Ernesto E Thermoelectric generator with latent heat storage
US4301682A (en) * 1979-08-24 1981-11-24 Everest Charles E Infrared thermometer in making stress-degree measurements for irrigation purposes
US4358957A (en) * 1980-09-05 1982-11-16 Teledyne Isotopes Temperature measuring method and apparatus
US6820897B2 (en) 1992-05-05 2004-11-23 Automotive Technologies International, Inc. Vehicle object detection system and method
US20020140215A1 (en) 1992-05-05 2002-10-03 Breed David S. Vehicle object detection system and method
US6048093A (en) * 1994-03-30 2000-04-11 Exergren Corporation Differential radiation detector probe
US6241384B1 (en) * 1996-10-25 2001-06-05 Exergen Corporation Axillary infrared thermometer and method of use
US6499877B2 (en) * 1997-06-24 2002-12-31 Exergen Corporation Ambient and perfusion normalized temperature detector
US20040075544A1 (en) 2000-11-29 2004-04-22 Holger Janssen System and method for monitoring the surrounding area of a vehicle
US20040058488A1 (en) 2002-05-08 2004-03-25 Arno Jose I. Monitoring system comprising infrared thermopile detetor
US20040057494A1 (en) * 2002-09-19 2004-03-25 Simon Tsao Ear thermometer with improved temperature coefficient and method of calibration thereof
US20040066832A1 (en) * 2002-10-07 2004-04-08 Hung-Te Lin Temperature measurement device
US7084342B2 (en) * 2003-06-17 2006-08-01 Watlow Electric Manufacturing Co. Semi-compensated pins for cold junction compensation
US20050094705A1 (en) * 2003-11-05 2005-05-05 Microlife Intellectual Property Gmbh Infrared thermometer and method for determining temperature

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9696362B2 (en) 2008-03-07 2017-07-04 Milwaukee Electric Tool Corporation Test and measurement device with a pistol-grip handle
US8274273B2 (en) 2008-03-07 2012-09-25 Milwaukee Electric Tool Corporation Test and measurement device with a pistol-grip handle
US9385352B2 (en) 2008-03-07 2016-07-05 Milwaukee Electric Tool Corporation Test and measurement device with a pistol-grip handle
US8193802B2 (en) 2008-04-09 2012-06-05 Milwaukee Electric Tool Corporation Slidably attachable non-contact voltage detector
US8920026B2 (en) * 2011-02-25 2014-12-30 Linear Technology Corporation Accurate current sensing with heat transfer correction
US20120218022A1 (en) * 2011-02-25 2012-08-30 Linear Technology Corporation Accurate Current Sensing with Heat Transfer Correction
US20150168220A1 (en) * 2013-12-17 2015-06-18 Ricoh Company, Ltd. Semiconductor integrated circuit
US9880058B2 (en) * 2013-12-17 2018-01-30 Ricoh Company, Ltd. Semiconductor integrated circuit
US9488527B2 (en) 2014-03-25 2016-11-08 Rosemount Inc. Process temperature measurement using infrared detector
US9857228B2 (en) 2014-03-25 2018-01-02 Rosemount Inc. Process conduit anomaly detection using thermal imaging

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